oak
n. C / U A2 Elementary US //ˈoʊk// UK //ˈəʊk// oak
n. a large, strong tree that produces small nuts called acorns. Its wood is very hard and people often use it to make high-quality furniture.
n. a large deciduous or evergreen tree of the genus Quercus, known for its hard, durable timber and its fruit, the acorn. The wood is valued for its strength and resistance to fungal attack.
The old oak tree provides plenty of shade in the summer.
The carpenter recommended using solid oak for the dining table because it lasts for generations.
Ancient forests dominated by oak were once the primary source of timber for shipbuilding, providing the structural integrity required for long-distance maritime exploration.
Usage
Countable when referring to the tree; uncountable when referring to the wood as a material.